Bookkeeping core
Lexware Office
SKR03 and SKR04 are both there, I can switch charts and existing bookings migrate automatically, and the monthly lock with a timestamped protocol gives me a real period close. But I found no public information on manual journals, opening balances, cost centres or accruals — and the business year is fixed to the calendar year with the calendar month as the booking period. A solid mid-level ledger, none of the accountant's extras shown.
Xero
The evidence evidences invoicing, bill entry and reconciliation, but not one word about a double-entry ledger, SKR03/SKR04, journals, opening balances or a period close — for German books that's the entire engine missing. I'd be buying an invoicing app with an invisible ledger underneath.